Laboratorycontrol

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We are the only producer of laboratory furnishings to offer fume hoods and variable fume hood controls crafted
by a single hand. Take advantage of our know-how on
laboratory room control questions.
We have completed a large number of projects
around the world in all kinds of sizes, all of which are being operated to the complete satisfaction of our customers. This confirms our philosophy of acting as a system
provider.
And we provide the additional advantage that you, as
a customer, only need to contact one partner to respond
to your questions – and especially when it comes to your
maintenance issues.
Being a full range supplier, we plan and complete
your project the typical Waldner way and in the shortest
time. Being the market leader, we have the capacity required for your projects – regardless of their scope – Just
contact us, we will be happy to provide you with advice.
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Clear operating cost savings regardless of operating
status
Business requirements no longer allow you to
separate your laboratory equipment from the ventilation
of the entire laboratory building. Waldner’s intelligent
laboratory controls significantly reduce ventilation system
operating costs and provide the highest level of work
safety.
Optimum function through engineering that is
properly thought through
Our fume hoods can be ideally integrated into the
ventilation concept for the building as a significant component of laboratory ventilation. The measurement and
control unit of our Airflow-Controller reliably recognizes
the fume hood’s utilization condition at all times and
within seconds precisely and securely adjustes the air flow
rate.
If needed, the user can manually decrease or increase
the air exchange rate at the hood anytime.
Investments in our laboratory room controls will
quickly amortize
Economic returns clearly speak for our laboratory
room controls: The laboratory room control will amortize
within one to two years, if the ventilation system is used
efficiently given appropriately reduced energy usage. This
is a significant advantage given continuously increasing
energy prices.
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Ventilation and controls as an overall concept
Being a leading system partner, we will create an
overall concept design for your laboratory. This will begin
with dimensioning the central ventilation system and
ducts to fit your usage requirements and end with implementing appropriate measurement, console, and control
engineering.
A Airflow damper canopy hood AC 3 Compact
B
Mechanical airflow damper
C
Airflow damper extract air AC3 Compact
D1 Airflow-Controller AC3 v Standard
D2 Airflow-Controller AC3 v pipe controller
E
Airflow damper supply air AC3 Compact
F
CAN-Bus
G Airflow-Controller with activated master function
for laboratory room controls
H The following methods of communication with the
DDC/building control are possible:
Analogue I/O, LON bus, MOD bus, Profibus,
BACnet, Ethernet
I
Sash controller SC
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Control Systems and Monitoring
Control Systems
Control system - Airflow-Controller (AC) for fume hoods fulfilling 
DIN EN 14175 Part 6
Airflow controller (AC)
The heart of Waldner control components is a central
unit consisting of an electronic control system controlled
by a microprocessor.
The standard set value for the airflow rate is determined
via the sash position. The processor controls this quickly
and precisely by using specific (adaptive or predictive)
control behavior. The microprocessor recognizes the
required damper valve position, disposes of a max. servo
velocity of two seconds for 90°, and is equipped with a
position feedback control. This allows all set point changes to be corrected in less than three seconds.
The controller calculates an appropriate measuring
diaphragm coefficient by integrating a range of variables
from the damper position and the differential pressure.
As required by DIN EN 14175, when the value drops
below the set point, an optical and acoustic alarm is
triggered. An optical and acoustic alarm is also triggered
when the sash is opened beyond the maximum permitted
sash opening.
As a standard, the control damper is used with the
extract air manifold. Motorized dampers must be used as
pipe controllers if the room height is less than 129.92 in
(3.30 m).
This feature is monitored and controlled when Secuflow technology is used. The supportive flow technology
shuts down when the exhaust air falls below specified
amounts.
If the supportive flow mechanism fails, the optical and
acoustic alarm is triggered and the extract air flow rate
will automatically increase to the rate of a standard fume
hood.
3
4
2
1 Display and operating device
2 Sensor technology to detect
the sash position
3 Extract air manifold with
actuator, measuring equipment and measured data
acquisition
4 Central control unit AC
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Fume hood and controller form a single unit
The systems are precisely synchronized, providing for
the highest level of reliability during ongoing laboratory
operations.
Both fume hood and variable air volume control are approved under DIN EN 14175 Part 6 as a complete safety device.
Thus, the time-consuming and costly coordination of different trades becomes unnecessary and legal security and warranty are provided by one supplier, if need be.
Fume hood control type approved under DIN EN 14175-T6 5.4
measurement in the exterior measuring plane
Comparison of Measuring Device Differential Pressure
Differential Pressure
Diaphragm
Differential
Pressure Shutter
Differential
Pressure AC
Differential Pressure (Pa)
Our patented measuring method and measuring 
equipment
A volumetric flow rate deviation of 1:15 can be achieved
through the variable diaphragm factor and the special way
that the measuring equipment functions. Air volume on the
fume hood can be reduced during night operations to
58.9 cfm (100 m3/h).
At the same time measuring accuracy for volume flow
value is guaranteed to +/- 5%. This is required to secure
compliance with directed air flow in the laboratory even
when volume flows are low.
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Control Systems and Monitoring
Control Systems
Differential pressure curve AC
Operating Panel AC Anzeige und Schalten:
– Light On/Off
– Optical and acoustic alarm
system
2
1
3
– Rinsing function (increase in air volume)
2
4
2
2
6
– Reduced operation
5
– Monitoring and feedback
control on/off
6
Measuring equipment for
Airflow-Controller
1 Control flap
2 Pressure measuring duct
3 Calibrated orifice
4 Extract air manifold
5 Pressure sensor
6 Magnetic valve
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Control Systems and Monitoring
Control Systems
Technical Data
Characteristics
Air flow rate range for DN 97.5 in (250 mm)
58.9cfm (100m3/h) - 882.9cfm (1500m3/h)
Air flow rate range for DN
122.85 in (315 mm)
117.7 cfm (200 m³/h) - 1765.8 cfm (3000 m³/h)
Measuring accuracy to actual value [%]
+/- 5
Nominal output [VA]
35
Motor operating time at 0-90° [sec]
2
Settling time [sec]
3
Allowable system pressure
0.015 psi (100 Pa) - 0.087 psi (600 Pa)
Inputs
Voltage supply
24 V DC
Digital input
6 pieces (parameters can be freely set)
Analogue input
1 pieces (parameters can be freely set)
Sash detector
2 pieces (vertical and horizontal sash detector)
Mod-Bus connection
RS 232
PDR connection
RS 232
CAN-Bus
Outputs
Digital output
5 pieces (parameters can be freely set)
Analogue output
1 pieces (parameters can be freely set)
Control of AC3 Compact
RS 485
Connection operating field
RJ 10
CAN-Bus
Motor control
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RJ 45
Master function to control the room
In order to create an overall air amount, the module will
cyclically register individual exhaust amounts from the
siphoned units in the laboratory room.
In each case, a minimum air exchange can be held for
four different operational states in the laboratory room.
The module will determine the corresponding minimum
value and will transmit these to the fume hoods or
volume flow regulators for the room exhaust systems, if
the minimum air-exchange rate is not achieved through
the fume hood minimum air values. The other fume
hoods or volume flow regulators for the room exhaust
systems will be lowered to their minimum air values, if the
air exchange rate exceeds the minimum when a fume
hood is opened. The room inlet air will be increased if the
minimum air exchange rate continues to be exceeded.
Temperature and room pressure can be regulated
through the module.
For the use of the fume hoods, a preset simultaneity
(max. exhaust amount per laboratory room) can be monitored. When the preset exhaust amount is exceeded a
signal is sent to the fume hoods in the laboratory.
The room ventilation volume controls (AC Compact)
are controlled by the control unit over an internal bus
system.
Data exchange between the laboratory room controls
and the DDC or GLT can take place over the following
interfaces:
– MOD bus RTU
– LON bus
– Profibus
– Ethernet
– BACnet
– Analogue I/0
Data points such as set values and actual values of
the airflow dampers, motorised damper positions,
error messages, operating states and sash positions
of the fume hoods can, e.g., be provided for
visualisation.
Complete solutions are available for implementing
a remote diagnostics system for laboratory
control components.
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Control Systems and Monitoring
Laboratory control
Strategy of laboratory control: waste air duct 100 % via fume hoods
Room air exchange
12 times
Fume hood
extract air
Minimum
8 times
air exchange
Input air
4 times
Air exchange rate
Strategy of laboratory control: room extract air in opposite direction of fume hoods
Room air exchange
12 times
Minimum
8 times
air exchange
4 times
Fume hood
extract air
Input air
Sum (fume hood extract air
+ Room extract air) – 5%
Room extract air
Air exchange rate
Two examples of variations on laboratory control systems
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Control Systems and Monitoring
Airflow controller for laboratory supply and exhaust air
AC3 Compact
Application areas
– Room intake control
– Room exhaust control
– Airflow measuring equipment / measuring orifice
(without control flap and actuating drive)
– Expansion module for AC3
Up to four AC3 compact controls can be switched on and
administered per AC3 control
AC3 Compact
Air amounts can be continuously variably controlled with
the AC3 Compact microprocessor-based electronic control unit.
It rapidly and precisely controls the airflow according
to the desired value and over a predetermined control
action (predictive and adaptive).
Performance characteristics
– Control parameters are adaptively optimized online
– Standard tolerances are predictively corrected using a
theoretical process model
– Motorized damper position feedback control
– Floating time: 5 seconds, settled
3 seconds, 80 % of setpoint
– Free ability to set parameters through PCs
– Integrated pressure sensor 0 psi (0 Pa) - 0.036 psi (250 Pa)
(pressure-resistant to 0.362 psi (2500 Pa))
– Motorized damper housing: galvanized, stainless steel,
PPs
Connections (parameters can be partially set)
– 2 x analogue output
– 1 x analogue input
– 1 x digital input
– 1 x operating field input RJ 10
– 1 x Modbus internal input RJ 45
– 1 x Modbus internal output RJ 45
– 1 x motor output RJ 45
– 1 x connecting plug with double terminals
24 VAC/DC, I max. 0.7 A (17 W)
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AC3 Compact
Actuating drive
Galvanized control housing with AC3 Compact and rapid actuating
drive
Technical Data
Design table for round supply and extract air airflow dampers
Nominal size
Fitting
length
Volume flow range B1
Volume flow range B0
Volume flow range B2
[in] (mm)
[in] (mm)
Vmin
[cfm] (m³/h)
V. nom.
[cfm] (m³/h)
Vmin
[cfm] (m³/h)
3.94 (100)
20.87 (530)
15.9 (27)
111.8 (190)
11.2 (19)
80 (136)
4.92 (125)
20.87 (530)
25.3 (43)
176 (299)
18.2 (31)
126 (214)
35.9 (61)
251.9 (428)
6.3 (160)
20.87 (530)
41.8 (71)
290.8 (494)
29.4 (50)
207.8 (353)
59.4 (101)
415.6 (706)
7.87 (200)
22.83 (580)
65.3 (111)
456.8 (776)
46.5 (79)
326.1 (554)
93.6 (159)
652.2 (1108)
9.84 (250)
22.83 (580)
102.4 (174)
716.3 (1217)
73 (124)
511.5 (869)
146.6 (249)
1023.6 (1739)
V. nom.
[cfm] (m³/h)
Vmin
[cfm] (m³/h)
V. nom.
[cfm] (m³/h)
23 (39)
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Control Systems and Monitoring
Airflow controller for laboratory supply and exhaust air
160.1 (272)
12.4 (315)
24.41 (620)
163 (277)
1141.3 (1939)
116.5 (198)
815.2 (1385)
233.1 (396)
1630.4 (2770)
13.98 (355)
24.41 (620)
207.2 (352)
1451.5 (2466)
148.3 (252)
1037.1 (1762)
296.7 (504)
2073.6 (3523)
15.75 (400)
24.41 (620)
263.7 (448)
1845.3 (3135)
188.4 (320)
1317.9 (2239)
376.7 (640)
2636.3 (4479)
19.69 (500)
37.8 (960)
412.6 (701)
2889.4 (4909)
294.9 (501)
2063.6 (3506)
590.4 (1003)
4127.3 (7012)
24.8 (630)
37.8 (960)
656.3 (1115)
4594.6 (7806)
468.5 (796)
3281.4 (5575)
938.8 (1595)
6563.5 (11151)

Design table for angular supply and extract air airflow dampers
Construction size
Fitting
length
Width
[in] (mm)
Height
[in] (mm)
[in] (mm)
7.87 (200)
5.51 (140)
9.84 (250)
5.51 (140)
11.02 (280)
6.3 (160)
12.4 (315)
7.09.(180)
13.98 (355)
7.87 (200)
Volume flow range B1
Volume flow range B0
Volume flow range B2
Vmin
[cfm] (m³/h)
V. nom.
[cfm] (m³/h)
Vmin
[cfm] (m³/h)
V. nom.
[cfm] (m³/h)
Vmin
[cfm] (m³/h)
V. nom.
[cfm] (m³/h)
20.87 (530)
57.7 (98)
405.5 (689)
148330 (70)
289.6 (492)
83 (141)
579.2 (984)
20.87 (530)
72.4 (123)
507.4 (862)
51.8 (88)
362.6 (616)
103.6 (176)
725.2 (1232)
20.87 (530)
93 (158)
651.6 (1107)
66.5 (113)
465.6 (791)
133 (226)
930.6 (1581)
22.83 (580)
118.3 (201)
826.4 (1404)
84.2 (143)
590.4 (1003)
168.9 (287)
1180.7 (2006)
22.83 (580)
148.3 (252)
1036.5 (1761)
105.9 (180)
740.5 (1258)
211.9 (360)
1480.9 (2516)
15.75 (400)
8.82 (224)
22.83 (580)
187.2 (318)
1310.8 (2227)
133.6 (227)
935.9 (1590)
267.8 (455)
1872.3 (3181)
15.75 (400)
11.02(280)
22.83 (580)
234.3 (398)
1641 (2788)
167.2 (284)
1172.5 (1992)
335.5 (570)
2344.4 (3983)
12.4 (315)
12.4 (315)
24.41 (620)
207.8 (353)
1453.3 (2469)
148.3 (252)
1037.7 (1763)
296.7 (504)
2076 (3527)
13.98 (355)
13.98 (355)
24.41 (620)
264.3 (449)
1848.2 (3140)
188.4 (320)
1320.2 (2243)
377.3 (641)
2640.5 (4486)
15.75 (400)
15.75 (400)
24.41 (620)
335.5 (570)
2349.7 (3992)
239.6 (407)
1678.1 (2851)
479.7 (815)
3356.8 (5703)
19.69 (500)
15.75 (400)
24.41 (620)
420.3 (714)
2940.1 (4995)
299.6 (509)
2117.8 (3598)
600.4 (1020)
4199.7 (7135)
24.8 (630)
15.75 (400)
24.41 (620)
529.7 (900)
3707.6 (6299)
377.9 (642)
2648.1 (4499)
757.5 (1287)
5296.2 (8998)
31.5 (800)
15.75 (400)
24.41 (620)
672.8 (1143)
4711.2 (8004)
480.3 (816)
3365 (5717)
962.4 (1635)
6730.1 (11434)
24.8 (630)
7.87 (200)
24.41 (620)
254.9 (433)
1844.1 (3133)
186 (316)
1317.3 (2238)
372.6 (633)
2634.6 (4476)
For optimum adaptation of the airflow dampers to the air exchange rate range and the size of the duct network, the
measuring panel sizes (B1/B0/B2) are available for each dimension. The standard version of the airflow dampers
includes the measuring panel B1.
Maximum air velocity in the measuring panel:
B1: 1377.95 FPM (7 m/s); B0: 984.25 FPM (5 m/s); B2: 1968.50 FPM (10 m/s)
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Control Systems and Monitoring
Monitoring
Monitoring - Function display (FAZ) for fume hoods fulfilling DIN EN 14175 Part 2
To warn laboratory personnel in the event of a failure
through optical and acoustic signals, DIN EN 14175 Part 2
requires continuous monitoring of ventilation functions in
fume hood. The optical signal cannot be turned off.
The FAZ is an electronic monitoring system that continuously measures the air exchange rate. When the
volume flow falls below the preset threshold value, it triggers both acoustic and optical alarms. This continuous
control of the airflow and, where needed, of the Secuflow
technology, guarantees a continuous monitoring of the
fume hood’s ventilation function.
The display is located in the fume hoods profile.
Alarms, such as lack of air, are signaled in red, while
warning, such as exceeding the max. sash opening
height, are signaled in orange. Pressing a button can
deactivate the acoustic alarm. A user-enabled on-off
switch for the FAZ system is available as an option.
Airflow measurement FAZ
The extract air manifold on the fume hood is used to
generate the air pressure signal.
The measurement method used is a differential pressure measurement. The function display works independent of room pressure fluctuations and independent of
the sash opening.
During nighttime operations, a second air volume can be
monitored.
2
3
4
1
FAZ operating field – Light On/Off
– Optical and acoustic
alarm system
– Not assigned
– Display night operation
– Function monitoring on/off
1 Display and operating device
2 Potentiometer sash position
3 Extract air manifold with differential pressure measurement
4 FAZ central unit
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FAZ differential pressure measurement
1 Extract air manifold, available in two versions: 9.84 in (250 mm) diameter and 12.40 in (315 mm)
2 Pressure sensor
9.84 in (250 mm) measuring pipe diameter for
scrubber and filter fume hoods
2
1
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Control Systems and Monitoring
Monitoring
Monitoring
Technical Data
Monitoring
Function display (FAZ)
Electrical power supply
24 V DC
Outputs
Alarm output
Status message
Light switch
Inputs
On
Off
Accoustic alarm shut-off
Night operations
Diameter [in] (mm)
9.84 (250), 12.40 (315)
System connection
Analogue I/0, Modbus
Sash controller
When the user lightly activates the sash, the sash’s
opening or closing process will be supported and completed by a motor.
When the fume hood is not used, the electronics of
the sash will close the fume hood sash with the aid of a
motor. The area in front of the fume hood is monitored
by a motion detector. If no movement occurs for a predetermined period of time, the sash will automatically close.
As a safety feature, a photoelectric barrier is built into the
bottom edge of the sash and prevents the sash from closing if there are obstacles in its path.
The requirements of TRGS 526, that fume hoods
which are currently not in use, are automatically and practically fulfilled through a sash controller.
The closing delay period after the sensors are enabled
can be set to between 30 seconds and ​
fifteen minutes.
Technical data SC
Closing device
Sash controller SC
Power supply
24 V DC
Nominal capacity
48 VA
Inputs
Open
Closed
In combination with an airflow controller the sash
controller can also be connected to the DDC/BMS.
Components:
1) Processor-controlled central unit
2) Motor drive (closes and opens the sash)
3) A photoelectric barrier that is integrated in the sash
frame serves to detect obstacles during the automatic
closing process
4) The motion detector will stop the sash when working
in front of the fume hood
1
2
3
4
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